Fluid pressure feeding mechanism for metal working tools



April 23, 1935. E. J. KINGSBURY FLUID PRESSURE FEEDING IECHANISV FOR METAL WORKINGV TOOLS Filed Jan. 10, 1950 2 sheets-Sheet 1 w r Q w n w gg-Swann Q w' Y l Q5 l? QS IN @5% Kw 3 n I .I j N NI l 1 f1 @1% T- E i' k3 :LY N A QQ g3g w W l* h S\ l w Ri v E 4 hu 1 qu l Q y Y lll'i l E i' if il NN l= O 5 k N O l b O QD qu S e `S\ N m 52 N N 1 Illu R1 Q I Sk 'se NN RR gg C y gwwMto/e f l I ),JW 711W i l www April 23, 1935. E. J. KLNGSEURY FLUID PRESSURE FEEDING MECHANISM FOR METAL WORKING TOOLS 2 Sheets-Sheet 2 Filed Jan. l0, 193D port I9 connected to a supply pipe I2a. An exit port I9b is connected to the chamber I8 vwhich takes the exhaust from the cylinder I2. The valve I8 is operated by a fluid controlled device which, as shown in the drawings, consists of a piston rod 20 carrying a piston 2I which is mounted for reciprocating in a cylinder 22 formed in the main frame 3.

At one end of said cylinder 22 is an inlet port 23 which is connected through a port 24 with the inlet port I9. A valve 25 is provided in this inlet port 24, which valve is normally held closed by means of a spring 29. This valve is released by a dog which is moved by the feed shaft as will be more fully described later.

Associated with the valve 29 is an exhaust valve 25a. Said exhaust valve is in the form of a sleeve having a tapered end 25h which fits in a seat in the top of the valve 25. Anspring 25e normally forces this valve in an upward direction. 'I'he opening 25d centrally of the sleeve is a port for allowing the exhaust of the air from the cylinder 22. This port 28d leads to a cross port which in turn leads to the atmosphere.

At the other end of the cylinder 22 is an inlet port 21 which connects with an inlet port 28 which in turn connects with the inlet port I8. There is a valve 29 which closes this inlet port 21 and this va1ve is raised by means of a spring 30. The valve 29 is likewise operated by this control dog which will be described later.

There is an exhaust valve 29a associated with the valve 29 and held normally raised by a spring 295; There isa port through this valve similar to that shown in detail in Fig. 3 in connection with the valve 25a. When the dog engages the upper end of the exhaust valve 29a it forces it downward, causing it to engage the'seat on the va1ve 29. This closes the exhaust port and a further downward movement of the valve 29a will unseat the valve 29 and allow the fluid to pass into the right hand end of the cylinder 22. When the dog 49 engages the valve 25a, likewise, it will be forced downward into engagement with the valve 25 thus closing the port through the valve 25a and unseating the valve 25. Just as soon as the dog 50 releases the valve 29a it will be raised by the springs 30 and 28h so as to seat the valve 29 and unseat the valve 29a.

Between the inlet port 28 and the inlet port I9 is the valve I8 which is normally forced to closed position by a spring 32 and when in closed position it cuts off communication between the port I9 an'd the port 28. This valve is lifted by a hand lever' 33 which is operated manually when it is desired to start the machine and set the feeding mechanism into operation. As long as this va1ve is raised the feeding mechanism will continue to move back and forth and be automatically reversed by this control device which has just been described in detail. In the drawings the hand lever is depressed, the valve raised and the machine in operation. y

The shaft 20 is connected by means of a link 20a to an arm I8a connected to the shaft carrying the valve I8.

Associated with this iiuid pressure feeding mechanism is a fluid controlled governing mechanism which permits the tool to be quickly advanced to a point adjacent the material-after which it is moved slowly into contact with the material and for the feeding of the tool during the cutting of the material.l This governing device includes a cylinder 34 formed in the main frame 3. Mounted in said cylinder is a' piston rod 3l carrying a piston 33. Mounted on the end ofthe feed shaft I I is a coupling head 31. This coupling head is rigidly attached to the piston rod 35. Said coupling head is sleeve formed and the end of the feed shaft II extends intosaid coupling head. There is an adjustable member 38 which closes the coupling head and this member slides freely on the shaft.

A set nut 38 is used for locking said member 38 in adjusted positions. On the extreme end of the feed shaft II is a fixed collar 4I). The coupling head is free to move on the feed shaft II until this collar 48 engages either the inner end of the coupling head or the, member 38. The cylinder 34 is preferably filled with oil. There is a port 4I leading from the left hand end of said cylinder 34 and a. port 42 leading from the right hand end of said cylinder. The needle valve 43 controls the flow of the oil from the left hand end of the cylinder to the right hand end of the cylinder. This needle va1ve is capable of being adjusted and is held in set positions by a spring finger 44. There is also a port 45 leading from the left hand end of the cylinder 34 and a port 43 leading from the right hand end of said cylinder.

Theseports are connected and the connection is controlled by a ball valve 41 which is spring pressed upwardly by means of a spring 48. This ball valve is so positioned that the oil can flow freely from the right hand end of the cylinder to the left hand thereof but cannot flow through the ports 45 and 46 from the left hand end to the right hand end.

Mounted on the coupling head 31 are the control dogs which bring about a reversal of the direction of movement of the feed shaft. There are two dogs one of which is indicated at 49 and the other at 50. The dog 50 is adjustably secured to the coupling head by a body 5I passing through a slot 52 in the dog. The dog 49 is held in adjusted positions by a similar bolt passing through a slot in the dog which are shown in broken lines in Fig. 1 of the drawings. The dog 50 operates upon the stem of the valve 29 and the dog 49 operates upon the stem of the valve 25. As shown in Fig. 1 the dog 50 has depressed the valve 29 and allowed uid to pass to the right hand end of the cylinder 22.

The operation of the device is thought tc be obvious from the above description. When the parts are in the position shown in Fig. 1 the feed shaft is at the extreme right of its movement and the operating tool retracted from the material. The retracting movement of the feed shaft through the dog 50 opens the valve 29 and permits uid under pressure to be supplied from the port I9 to the cylinder 22 and moves the piston 2I to the left hand, and this has reversed the valve I8 so as to permit fluid to pass from the supply port I9 to the right hand end of the cylinder I2. |IS'he feed shaft will now move forward and will move very rapidly until-the collar 4I) engages the member 38 and causes the piston 38 to move with the feed shaft. At this time the'oll in the cylinder 34 will retard the forward movement of the feed shaft and thus stop the rapid advancement of the tool before it strikes the material. The by-pass will permit the oil to flow slowly from one side of the piston 36 to the other under the control of the needle valve which may be adjusted and this permits the continued advance movement of the feed shaft II and a feed of the tools during the cutting operation on the material.

When the feed tools have finished their forward movement then the dog 49 will engage the vslide will be reciprocated back stem of the valve 25 and will open this valve. Meanwhile the valve 29 has been 'released and closed but is held yieldingly closed. Air under pressure now will pass from the port 24 through the port 23 to the left hand end of the cylinder 22 and this will move the piston 2l along the cylinder 22 and reverse the valve I8 so as to permit air under pressure to pass 'from the port I9 through the port Il into the cylinder l2, and thus move the feed shaft to the right. When the feed shaft starts its movement to the right, the collar i0 moves away from the member 38 and will finally Contact with the inner end of the coupling head 3l. The piston 36 is free to move to the right hand end of the cylinder 345 as the oil is then by-passed through the ports it andii forcing the ball valve @i away from its seat. This allows the tool to be very rapidly retracted. rfhis retracting, movement of the feed shaft through the dog 5t releases the valve 2t! which begins the next feeding cycle.

Just as long as the valve i8 is raisedvfrom its seat and :duid is supplied to the port 28 the feed and forth, continuing its cycles of operation. When the valve 3l is closed, then the air pressure is cut olf from the port 28 but not off from the port 24, and therefore, the feed shaft will move until it reaches its fully retracted position when it willstop. This manually controlled valve is a means for rendering the fluid controlled reversing means effective orineffective. When it is opened, then this fluid controlled reversing means becomes elfective and the cycles of operationcontinue, one after another. On the other hand, when the valve is closed, then the reversing means is rendered ineffective and the feed slide will stop in its retractedposition.

While the invention as shown is applied to a multiple spindle drill press, it will be understood that it may be used in connection with a single spindle drill press or as a means for feeding any kind of .tools for machining operations.

It will be obvious also that the details of construction and the arrangement of parts may be widely varied Without departing from the spirit of the invention as set forth in the appended claims.

Having fully described the invention, what is claimed as new and desired to be secured by Letters Patent, is:-

1. In a metal working machine, the combination oi' a translatable member, uld pressure means for moving said member back and forth, a governing means for controlling the forward movement of said translatable member including a cylinder, a piston in said cylinder, a piston rod attached to said `piston, a sleeve carried by said piston rod, a member connected to said translatable member and extending into said sleeve, a collar carried by the end of said member extending nto said sleeve, an adjustable member for closing the end of the sleeve and serving as a stop for retarding the movement of the translatable member, a needle valve bypass for bypassing fluid from the front side of said piston to the rear side thereof while the translatable member is moving in a forward direction under control of said piston, and a check valve controlled bypass leading from the rear side of the piston to the front side thereof for bypassing the fluid when the translatable member is moving in a backward direction.

2. In a metal working machine, the combination of a translatable member, a fluid pressure motor for moving said member back and forth including a cylinder, a iiuid operated piston in said cylinder, a piston rod connecting said piston to said translatable member, means for reverslng the flow of uid pressure to the motor for reversing the movement of the piston and the translatable member, a separate governing means for controlling the forward movement of said translatable member including a cylinder, a piston in said cylinder, a piston rod connected to said lastnamed piston, a sleeve carried by said last-named piston rod, said piston rod of the uid pressure' motor being extended through the end of the fluid pressure cylinder into said sleeve, a collar on the end of said fluid pressure piston rod, an adjustable member for closing the end of the sleeve and serving as a stop for retarding the movement of the piston rod in the fluid pressure cylinder on the forward stroke of the translatable member, a needle valve bypass for bypassing fluid from the front side of said piston to the rear side thereof while the translatable member is moving on its forward stroke under the control of the governing means, and a check valve controlled bypass leading from the rear side of the piston to the front side thereof for bypassing fluid when the transatable member is moving in a backward direclon.

EDWARD JOSLIN KINGSBURY. 

